Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90c420aa88e3b299eec70e5e388ab35f41fa47bbb3096a2eedbae6faad2a6316' 
  AND token = 'p49NhtqciPJEL5iDJDCuKuegRpuaZtb5v/mf0um+OdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}